This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 3 |
| 6 | 11 |
| 7 | 31 |
| 8 | 71 |
| 9 | 157 |
| 10 | 397 |
| 11 | 1141 |
| 12 | 3301 |
| 13 | 9087 |
| 14 | 24311 |
| 15 | 66067 |
| 16 | 185771 |
| 17 | 532121 |
| 18 | 1520889 |
| 19 | 4316233 |
| 20 | 12255913 |
| 21 | 35079739 |
| 22 | 101232419 |
| 23 | 293236615 |
| 24 | 849895311 |
| 25 | 2465119669 |
| 26 | 7167636741 |
| 27 | 20909386941 |
| 28 | 61162159501 |
| 29 | 179214613111 |
| 30 | 525803297743 |
| 31 | 1544899158331 |